Ultracold Cs atoms are of great interest for a number of
experiments, which have produced a Bose-Einstein condensate of
such atoms [1]}, formed a cold cloud of Cs\(_2\) 
dimer molecules [2]}, probed three-body Efimov
physics [3]}, studied collisional
shifts [4]} or quantum
scattering [5]} of atomic clock states, carried out
high-resolution molecular spectroscopy [6]} or
used magnetic fields to switch among a variety of very weakly
bound molecular states of the Cs\(_2\) 
dimer [7]}, [8]}. These experiments all depend
upon and take advantage of the collisional interactions between
two Cs atoms. Consequently, accurate theoretical and
computational models of near-threshold Cs atom scattering and
bound states are necessary for maximum understanding of
existing experiments and for making quantitative predictions
for new experimental domains.
